diff --git a/q7.cpp b/q7.cpp
new file mode 100644
index 0000000..fef2429
--- /dev/null
+++ b/q7.cpp
@@ -0,0 +1,13 @@
+#include<iostream>
+using namespace std;
+int main(){
+    int t;
+    float k, b, m, d;
+    cin>>t;
+    cin>>k>>b;
+    m=b-k;
+    d=k-m;
+    cout<<"an = "<<m<<"n + "<<"("<<d<<")"<<endl;
+    cout<<"a"<<t<<" = "<<m*t+d;
+
+}
\ No newline at end of file