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Self Practice 7B, , fyaluate each expression for the given value of the variable, Ie @).x + Moree 2, , (d) 7a-3 fora=1, 2. (a) y- 2x for y= 25,x=7, , (b) y-7 for y= 10, , (c) 5a fora=2, (e) 9d for d=0, , (f) 16 - 4y for y=4, (b) 3a+ 4b fora=-1,b=2, , (d) 10x+z-yforx=3,y=-5,z=7, (b) a? + 3b fora=2,b=-1, (c) 36—2x* forx=4 (d) 24+ forx=-ly=-2, , 4. From the formula A = 3a + 5b ~ 8c - 29, find the value of A when a= 18, b= 0, , EQUATIONS, , () 5 —x) forx=1.5,y=35, 3. (a) 4x? forx=3, , and c = -3., , An equation is that which uses an equal sign <— to show that two expressions are equal. All of the following, are equations., , i 14, Ae 8, ove pny, 54+9=14, 6+n=10, i 3, , ion (=) and a right side., An equation contains a left side, an equal sign (=) and a rig!, , ao 9, | 1 night side