Question 897423
standard form for linear equation is f(x) = ax +b
now the function value (0, 7) gives us the value of b, that is,
f(x) = 7 = a(0) +b and b = 7
so far we have
f(x) = ax +7
let's pick another value, say (-4, -3), then we have
f(x) = -3 = a(-4) +7
-10 = -4a and
a = 10/4 = 5/2 and our equation is
f(x) = (5x/2) + 7
a) f(-4) = (5*-4/2) + 7
f(-4) = -10 +7 = -3
b) f(2) = (5*2/2) +7
f(2) = 5 + 7 = 12
c) f(x) = 7 = (5*0/2) +7 = 7
x = 0